Water-coobed door for furnaces



; DOWNS.

WATER COOLE DOOR FR FURNCES.

APPLICATmN mm Nov. i4. mis.

1,312,168, imnfld A111@ im,

3 SHEETS-SHEET Z.

G. F. DOWNS.

WATER COOLED DOOR FOR FURNACES.

APPLICATION FILED NOV. I4. i918.

Patented Aug. 5, i919.

3 SHEETS-SHEET 3.

GrllOlEtGrlElv F. DOWNS, 0F BUFFALO, NEW YORK.

WATER-00011111) DOOR FOR FURNACES.

Specification of Letters Patent.

Patented A110'. 5. 1919.

Appiieanori ined November 14, 191s. seriai No. 262,478.

To all whom t may concern Be it known that I, GEORGE F. DOWNS, a citizen of the United States, and a resident of Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Water-Cooled Doors for Furnaces; and I do hereby deelai'e that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which forni a part of this specification.

This invention relates to improvements in water cooled doors for furnaces and consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The invention as illustrated herein, is shown embodied in a dooi' for open hearth furnaces, Where its use is of especial ad- Vantage owing to the intense heat;'but, as

will appear, it is in no way limited to such use as it may be advantageously employed in 'connection with other types of furnaces.

The several objects and the novel features of the invention will be pointed out as I proceed with' my specification.

In the drawings:

Figure 1 is a view representing in elevation av part`of the side wall of an open hearth furnace, with my improved water cooled door in place thereon.

Fig. 2 represents a vertical section through said side wall and through said door, the plane of the section being indicated by the line 2 2 of Fig. 1.

Fig. 3 is a view showing, on an enlarged scale, the door itself in front elevation, with the front, wall partially broken away.

Fig. 4 is a view representing a rear elevation of the door. p

Fig. 5 shows a top plan view of the door o'n a still larger scale.

`ig. 6 presents, On the scale of Fig. 5, a transverse section thi-Ongi the door in a plane indicated by the line (3 6, of Fig. 3.

Fig. 7 shows, on the scale of Fig. 5, a vertical section through the door in a plane indicated by the line 7 7 of Fig. 3.

Referring now to that embodiment of my invention shown in the drawings and particularly when applied to an open hearth furnace 5 1() indicates a partof the side wall of an open hearth furnace adjacent one of the furnace door openings; 11, the door opening; and 12 indicates the improved door. 'l`he door 12 is li'ung and arranged'in a familiar way to befi'aiscd or lowered to uni-lose or close the opening 11, resting normally on a base or sill 13 when in closed position` and being adapted to be raised or lifted by means of links 11, 14, pivotally connected to ears 15, 15 at the top of the door, and being operable by a hydraulic or other device 16, in a well known manner.

The door comprises an outer cast metal., hollow shell 17: a removable conduit 1S located on the inner face ot said shell and following the outline of the door; and a refractory lining 19 which is preferably supported and held in place by means ot the conduit 1S. The shell 17 has a flange 2() at the top and has side flanges 21, 21. vertical rib or web 17" connectingthe front and rear walls of the said shell and extend.- ing along the median line of the door from the top to a point somewhat above, the bottom, divides thewater compartment 17"l in the shell into two parts connected by a passage at the bottoni.

The conduit 1S consists ot' a pipe having upright branches 22, 22 which are located adjacent to the side flanges 21, 21 ot' the door Shell 17, und a horizontal branch 22E. The side branches 22, 22 extend through suitable holes or openings formed in the top fiangef 20. The lupper end parts of said branches are threaded to receive lock nuts 22, 22, by means ot' which the conduit as a whole is supported in place. One of the' branch pipes 22 is connected by a reducing couple 27 to a pipe 2-1 which is telescoped upon an upright pipe 37'of smaller diameter. The pipe 37 is connected to a main water supplypipe 39,'-11 hose 235? being interposed in the connection to provide for greater Hexibility when the door is raised or lowered- The other branch 22 ot' the conduit is connected by a. coupling 27 to a be' withdrawn downwardly and removed from the doorhto oc replaced by another one of the saine kind An overflow pipe 28 is attached to the pipe'24 of the supply system,

vface flat and inclined inwardly and toward the center of the door. By this construction, the conduit itself' provides a means for retaining the lining of' fire-brick 19 in place. The top flange 20 has its inner face 20a likewise inclined inwardly and toward the center ot' the door Jfor the same purpose. After thelining is in place, it may be securely locked by means of the lock nuts '22 which act. to draw up the conduit.

-Near the top ofl the door there is formed in the cast metal shell 1T, a hole or opening 29 to which is connected a discharge pipe 30. Said discharge hole is made in that compartment which is farther from the discharge pipe. 26, so as to insure a circulation ot' the cooling water. 'l`he dischargepipe 30, as shown, is connected b v 4a branch pipe `3l to a depending pipe 32, which telescopes within an upright receiving pipe'll of larger diameter, in such -manner that as the door is raised and lowered, connection will always be maintained' between the pipe 32'aiid the,v

pipe 33. 'lhe pipe 33 leads to a suitable source ot' final discharge of the water.-

The improved dooi is provided with the usual peep hole 34, which extends through the cast metal part or piece of the door and also throughthe tire brick lining. Said peep hole. is closed by means of a plate or disk 35 which is guided` supported and held in l)lace by iiicans of top and bottom flanges 36 in the usual way.

It will be apparent that water supplied .to the pipe 24 will pass, first, through the entire length ot' the conduit t8, thus'providing a cooling medium, for the lateral margins and the bottoni margin ot' the dooi. It will thence be discharged through the discharge pipe 2G into the cooling water compartment 1T in the shell piece 1T, after circulating through which, it will be discharged into the pipe'30. Thus, as described and pref'erred, the circulatory systems of the con-- duit and ofthe front piece olA the door are iiitciconi'iected but it will be manifest that this is not essential and that they may be independent.

The overflow pipe 2S takes care of' fluctuations in pressure in the supply main. which are apt.` to occur l'roni time to time on accomit ot' the variations in the demands made on said main.` sudden increase of tlow would cause a splash atl the telescoping connection between the pipe 24 and the pipe 37;

but this is prevented by' the said overflowl npe.

At the sides of the shell piece 1T at the bottom, are' provided thneaded openings familiar with the art. The outer door piece or shell may bev made of' such thickness and strength as to successfully resist any and all shocks to which it may be subjected, and as it is water cooled, and in additionlis not di rect-ly exposed to the flame, its life is ttlmost indefinite. The inside marginal edges` at t-lie sides and at the bottom of the door, which are exposed to the flame, are provided by the water cooled conduit and if, for any cause. said conduit begins'to leak, the. doo;

may be removed and a new conduit substi-.r

. cost ot' little effort and labor.

' tuted t'or the defective one, and this withoutfg While I have described my improvedV top and with side flanges on its` inner face,

and a second water cooled piece consisting ot' a. conduit having two side branches and a bottoni branch, the side branches being engaged against the side flanges ot the front piece and extending through openings provided in the top flange of vsaid front piece, and means for detachably supporting said second piece upon the top flange of' said f'roiit pieces.

A' door for furnaces comprising a water` cooled, front metal piece, provided with a top and with side flanges on its inner "tace, a second water cooled piece consisting-of a conduit having two side branches and a bottom branch, the side branches being engaged against tlieside flanges of the front piece and extending through openings provided in thc top flange ot' said Jt'ront piece, lock nuts threaded upon the said side branches of said condiiit.z`ib ve the top flange ot' said front. piece, and a refractory lining located against thc'innerl face of' the front iro ica

' the bottom of said front piece and side branches engaged within the side anges of said front iece, said side branches projecting tlirougi openings in the top flange of said front piece, lock .nuts threaded upon the upwardlxv projectingvends of said side branches of the conduit, and a refractory lining placed against the inner face of said lfront piece, and said conduit being of across section adapted to engage and retain said refractory lining m place. 4, A door for furnaces comprising a hollow, cast metal front piece, said front piece being provided with flanges on its in-v ner face at the top and sides thereof, a metal conduit placed against the inner face of said front piece having a horizontal branch at the botflom of said front piece and side branches engaged within the side flanges of said front` piece, said side branches projecting through openings in the top flange of said front piece, lock nuts threaded upon the upwardly projecting ends of said side branches of the conduit, a refractory lining nlaced against the inner face of said front ieee said conduit beine of a cross section adapted to engage and retain said refractory lining in place, and means for supplying and discharging cooling water for circulation through said conduit and through said front piece.

5. A door for furnaces comprising a rectangular cast metal, watcr-jacketed front piece, having a rearwardly extending flange along its 'top inner edge, a conduit having side and bottom members, arranged on the inner rear face Iof and outlining the`sides and bottom of said front piece, the Side members of said conduit extending through and being removably attached to said rearwardly extending frange of said front piece, and means providing a water connection between one of the side members of said conduit with the water jacket of said front piece.

In testimony that l claim the foregoing as my invention, I affix my signature in the presence of two witnesses, this 11 day of November, A, D., 1918.

I GEORGE F. 1)()\VN S.

Witnesses:

J ULiA WUNson, WAI/mn J. BRYAN. 

